1175t/h锅炉过热汽欠温和再热汽超温原因分析及改造

Analysis and Retrofit on Superheater Underheating and Reheater Overheating of a 1 175 t/h Boiler

针对某1 175t/h锅炉因过热器受热面不足造成过热汽温偏低,燃烧器向上摆动时造成炉膛出口烟气残余旋转增大,烟气流量、烟温和汽温偏差增大,再热器金属温度过高,并加大了再热器减温水量,提出屏式过热器向下加长1m和低温过热器加一圈立式管等措施解决了上述问题。

To solve the problems existing in a 1 175 t/h boiler, such as high residual rotation of the flue gas at furnace outlet and high deviation of the gas flow, gas temperature and steam temperature during upward swinging of the burner, caused by underheating of the superheater due to insufficient heating surfaces, which have led to overheating of the reheater and increased water consumption for subsequent attempering purpose, specific retrofit measures have been proposed, such as lengthening the platen superheater downward by 1 m and adding a coil of vertical tube to the low-temperature superheater, etc. Above problems have finally been solved after implementation of the retrofit measures.